Modem controller

Details Modem controller Modem controller

1985-10-29

1988-05-03

Harkcom, Gary V.

Boots, shoes, and leggings

371 66, 375 8, 365228, 34082516, G06F 1100, G06F 1300

Patent

active

047424826

ABSTRACT:
A memory (90) comprising a non-volatile memory and a volatile memory, contains a test word and other words which represent a complete user-selected configuration profile. The configuration profile is stored in the memory (90) by a microprocessor (36) automatically when power is interrupted. A second power supply (80) provides operating power to the memory (90) so that the memory (90) can complete its storage cycle even after primary power has failed. The microprocessor (36) checks memory (90) for the test word to verify that the memory (90) has been programmed with a configuration profile and is not missing or defective. The modem (12) resets when power is first applied and when the power supply (75) noise exceeds a predetermined safe level. A concealed jumper strap (61) allows for the reversible placement of the modem (12) into a "dumb" mode wherein the configuration profile cannot be altered.

REFERENCES:
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patent: 3937937 (1976-02-01), McVey
patent: 4015206 (1977-03-01), Huntley
patent: 4087855 (1978-05-01), Bennett et al.
patent: 4306299 (1981-12-01), Check, Jr. et al.
patent: 4307455 (1981-12-01), Juhasz et al.
patent: 4327410 (1982-04-01), Patel et al.
patent: 4458307 (1984-07-01), McAnlis et al.
patent: 4525800 (1985-06-01), Hamerla
patent: 4591782 (1986-05-01), Bermer

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